• Study population:

∙ Subgroup #2: Histopathologically confirmed recurrent supratentorial WHO grade 3 or 4 malignant glioma (high grade glioma with molecular features of glioblastoma will be eligible under WHO grade 4 malignant glioma)

‣ Subgroup #3: Histopathologically confirmed recurrent supratentorial WHO grade 4 malignant glioma (high grade glioma with molecular features of glioblastoma will be eligible under WHO grade 4 malignant glioma) and found amenable for Tumor Monorail Device (TMD) implantation as per the treating neurosurgeon

• Patient or partner(s) meets one of the following criteria:

∙ Non-childbearing potential (i.e.) not sexually active, physiologically incapable of becoming pregnant, including people who are post-menopausal or surgically sterile. Surgically sterile people are defined as those with a documented hysterectomy and/or bilateral oophorectomy or tubal ligation or have had a vasectomy. Postmenopausal for purposes of this study is defined as 1 year without menses.; or

‣ Childbearing potential and agrees to use one of the following methods of birth control: approved hormonal contraceptives (e.g. birth control pills, patches, implants, or infusions), an intrauterine device, or a barrier method of contraception (e.g. a condom or diaphragm) used with spermicide.

• Age ≥ 18 years of age at the time of entry into the study

• Karnofsky Performance Score (KPS) ≥ 70%

• Hemoglobin ≥ 9 g/dl prior to biopsy

• Platelet count ≥ 100,000/µl unsupported is necessary for eligibility on the study; however, because of risks of intracranial hemorrhage with catheter placement, platelet count ≥ 125,000/µl is required for the patient to undergo biopsy and catheter insertion, which can be attained with the help of platelet transfusion

• Neutrophil count ≥ 1000 prior to biopsy

• Creatinine ≤ 1.5 x normal range prior to biopsy

• Total bilirubin ≤ 1.5 x ULN prior to biopsy (Exception: Participant has known or suspected Gilbert's Syndrome for which additional lab testing of direct and/or indirect bilirubin supports this diagnosis. In these instances, a total bilirubin of ≤ 3.0 x ULN is acceptable.)

⁃ AST/ALT ≤ 2.5 x ULN

⁃ Prothrombin and Partial Thromboplastin Times ≤ 1.2 x normal prior to biopsy. Patients with prior history of thrombosis/embolism are allowed to be on anticoagulation, understanding that anticoagulation will be held in the perioperative period per the neurosurgical team's recommendations. Low molecular weight heparin (LMWH) is preferred. If a patient is on warfarin, the international normalized ratio (INR) is to be obtained and value should be below 2.0 prior to biopsy.

⁃ At the time of biopsy, prior to administration of D2C7-IT, the presence of recurrent tumor must be confirmed by histopathological analysis

⁃ A signed informed consent form approved by the Institutional Review Board (IRB) will be required for patient enrollment into the study. Patients must be able to read and understand the informed consent document and must sign the informed consent indicating that they are aware of the investigational nature of this study

⁃ Able to undergo brain MRI with and without contrast

• Patients must have a recurrence of their supratentorial WHO grade IV4 malignant glioma based on imaging studies with measurable disease requiring therapy other than per protocol allowed reduced dose bevacizumab

• Patients must be ≥ 4 months since their intratumoral administration of D2C7-IT + 2141-V11

• A new signed informed consent form for the treatment with 2141-V11 in the CPL area ipsilateral to the tumor approved by the Institutional Review Board (IRB) of record will be required. Patients must be able to read and understand the informed consent document and must sign the informed consent indicating that they are aware of the investigational nature of the injection of 2141-V11 in the CPL subcutaneous area.

• If the subject is able to produce sperm and is sexually active, they are eligible to enter and receive treatment with 2141-V11 injected in the CPL subcutaneous area if their partner(s) meets the criteria outlined in sub-bullet a. below or if they or their partner(s) are using one of the methods of birth control outlined in sub-bullet b. below. If the subject is potentially able to become pregnant, they are eligible to enter and participate in this study if they meet the following criteria:

∙ Non-childbearing potential (i.e., physiologically incapable of becoming pregnant, including people who are postmenopausal or surgically sterile). Surgically sterile people are defined as those with a documented hysterectomy and/or bilateral oophorectomy or tubal ligation. Postmenopausal for purposes of this study, is defined as 1 year without menses); or

‣ Childbearing potential, has a negative serum pregnancy test at screening, and agrees to use one of the following methods of birth control: approved hormonal contraceptives (e.g., birth control pills, patches, implants, or infusions), an intrauterine device, or a barrier method of contraception (e.g., a condom or diaphragm) used with spermicide.

‣ Please note: If the patient has had a vasectomy or is using a condom with spermicide, their partner does not need to use additional birth control noted in 4a and 4b.

• Total bilirubin ≤ 1.5 x ULN prior to CPL injection (Exception: Participant has known or suspected Gilbert's Syndrome for which additional lab testing of direct and/or indirect bilirubin supports this diagnosis. In these instances, a total bilirubin of ≤ 3.0 x ULN is acceptable.)

• AST/ALT ≤ 2.5 x ULN prior to CPL injection.

• Neutrophil count ≥ 1000 prior to CPL injection.

• Platelet count ≥ 50,000/µL unsupported is necessary prior to CPL injection.

• Creatinine ≤ 1.2 x normal range prior to CPL injection.